Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:8695a –
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السيوطي:٨٦٩٥a –

"أَوْتِر قَبْلَ أَنْ تَنَامَ، وصلاةُ الليلِ مَثْنَى مَثْنَى ".  

[طب] الطبرانى في الكبير عن عمار

See similar narrations below:

Collected by Ibn Mājah
ibnmajah:1319 – Muḥammad b. Rumḥ > al-Layth b. Saʿd > Nāfiʿ > Ibn ʿUmar

“The night prayer is (to be offered) two by two.”  

ابن ماجة:١٣١٩ – حَدَّثَنَا مُحَمَّدُ بْنُ رُمْحٍ أَنْبَأَنَا اللَّيْثُ بْنُ سَعْدٍ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ صَلاَةُ اللَّيْلِ مَثْنَى مَثْنَى